690021699 has 4 divisors (see below), whose sum is σ = 920028936. Its totient is φ = 460014464.

The previous prime is 690021667. The next prime is 690021713. The reversal of 690021699 is 996120096.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 690021699 - 2⁵ = 690021667 is a prime.

It is a super-2 number, since 2×690021699² = 952259890181693202, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 690021699.

It is not an unprimeable number, because it can be changed into a prime (690021649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115003614 + ... + 115003619.

It is an arithmetic number, because the mean of its divisors is an integer number (230007234).

Almost surely, 2^690021699 is an apocalyptic number.

690021699 is a deficient number, since it is larger than the sum of its proper divisors (230007237).

690021699 is a wasteful number, since it uses less digits than its factorization.

690021699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230007236.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 690021699 is about 26268.2641032863. The cubic root of 690021699 is about 883.6648551591.

The spelling of 690021699 in words is "six hundred ninety million, twenty-one thousand, six hundred ninety-nine".